A tag that allows, for a a third variant (other than monsters, and friendlies) of the "living entity" object

This tag would be useful, as it would allow for modders to add a "faction" system, for example, the player could recreate the HECU from Half-Life, where they attack all non-HECU members (i.e monsters, allies, and of course the player) or competing factions (Soldiers vs. Mutants vs. Aliens, etc) or even function as a Sentry-Gun that target's everything in it's vicinity (like Aliens, or Doom 3)

Of course the tag would work in a way, where it wouldn't attack decorations, and non-monster, non-player, and non-friendly objects (chairs, sfx items, et cetera) and any other object marked with another new tag (+NotAutoTargetedByAllButSpecies) for use by stealth monsters, or others.